BLACK SEAL TC EXAM 140 QUESTIONS & CORRECT
ANSWERS LATEST 2025
At 0 psig, how many Btu's are necessary to change 1 pound of water at 212F into
1 pound of steam? - ANSWER-970.3
Steam at 100psi and 400F is - ANSWER-superheated
What is required to raise the temperature of 1 pound of water from 32F to 212F?
- ANSWER-180 Btu
A boiler horsepower is defined as - ANSWER-evaporation of 34.5 pounds of water
One boiler horsepower is equal to how many Btu's - ANSWER-33,472
2545 Btu hours represents - ANSWER-1 horsepower hour
Atmospheric pressure is considered to be - ANSWER-14.7psi
In a water tube boiler, the gases of combustion will pass - ANSWER-around the
tubes
What is the minimum thickness allowed for an atmospheric type blowdown tank?
- ANSWER-5/16
,Before the burner ignites, what is the minimum number of furnace volume air
changes that should be provided by the purge cycle? - ANSWER-four
Which best describes balanced draft? - ANSWER-forced and induced draft fans
keep the furnace below atmospheric pressure
Which formula would you use to calculate the Btu/lb. heat content of fuel oil? -
ANSWER-17,687 + 57.7 x API at 60F
Which stack gas reading would show good combustion? - ANSWER-low oxygen
and carbon monoxide, high carbon dioxide
What ASME code denotes a high pressure power boiler? - ANSWER-S
Where would you find a cyclone separator? - ANSWER-in the stream drum
What is the total force acting on a safety valve of a 325 psi boiler with a 2 ½'
diameter safety valve? - ANSWER-1595.34
What is the overspeed trip setting on a turbine with a normal operating speed of
1770 rpm? - ANSWER-1947rpm
Saturated steam is defined as - ANSWER-steam at a temperature corresponding
to its pressure
One mechanical horsepower is equal to - ANSWER-33000ft lb/min
, Why are boiler manways and handholes oval? - ANSWER-for removal from
pressure vessels
Shrouds are found on what piece of auxiliary equipment? - ANSWER-steam
turbines
Where is caustic embrittlement most likely to occur? - ANSWER-on a riveted joint
below the water line
What two elements in fuel oil produce most of its heat? - ANSWER-carbon and
hydrogen
What is the heating surface of water tube with a diameter of 3 ½" and 20 ft long?
- ANSWER-18.32ftsq
Where should sodium sulfite be added to a boiler for maximum efficiency? -
ANSWER-the deaerator
What is the horsepower of a 35,500 #/hr boiler with an evaporation rate of
10lb/ftsq of heating surface per/hr? - ANSWER-1000HP
If steam were reduced by a PRV from 500psi to 125psi, the steam at 125psi would
have - ANSWER-same heat as 500psi
Which device would be found on the inlet line of a steam turbine condenser? -
ANSWER-atmospheric relief valve
ANSWERS LATEST 2025
At 0 psig, how many Btu's are necessary to change 1 pound of water at 212F into
1 pound of steam? - ANSWER-970.3
Steam at 100psi and 400F is - ANSWER-superheated
What is required to raise the temperature of 1 pound of water from 32F to 212F?
- ANSWER-180 Btu
A boiler horsepower is defined as - ANSWER-evaporation of 34.5 pounds of water
One boiler horsepower is equal to how many Btu's - ANSWER-33,472
2545 Btu hours represents - ANSWER-1 horsepower hour
Atmospheric pressure is considered to be - ANSWER-14.7psi
In a water tube boiler, the gases of combustion will pass - ANSWER-around the
tubes
What is the minimum thickness allowed for an atmospheric type blowdown tank?
- ANSWER-5/16
,Before the burner ignites, what is the minimum number of furnace volume air
changes that should be provided by the purge cycle? - ANSWER-four
Which best describes balanced draft? - ANSWER-forced and induced draft fans
keep the furnace below atmospheric pressure
Which formula would you use to calculate the Btu/lb. heat content of fuel oil? -
ANSWER-17,687 + 57.7 x API at 60F
Which stack gas reading would show good combustion? - ANSWER-low oxygen
and carbon monoxide, high carbon dioxide
What ASME code denotes a high pressure power boiler? - ANSWER-S
Where would you find a cyclone separator? - ANSWER-in the stream drum
What is the total force acting on a safety valve of a 325 psi boiler with a 2 ½'
diameter safety valve? - ANSWER-1595.34
What is the overspeed trip setting on a turbine with a normal operating speed of
1770 rpm? - ANSWER-1947rpm
Saturated steam is defined as - ANSWER-steam at a temperature corresponding
to its pressure
One mechanical horsepower is equal to - ANSWER-33000ft lb/min
, Why are boiler manways and handholes oval? - ANSWER-for removal from
pressure vessels
Shrouds are found on what piece of auxiliary equipment? - ANSWER-steam
turbines
Where is caustic embrittlement most likely to occur? - ANSWER-on a riveted joint
below the water line
What two elements in fuel oil produce most of its heat? - ANSWER-carbon and
hydrogen
What is the heating surface of water tube with a diameter of 3 ½" and 20 ft long?
- ANSWER-18.32ftsq
Where should sodium sulfite be added to a boiler for maximum efficiency? -
ANSWER-the deaerator
What is the horsepower of a 35,500 #/hr boiler with an evaporation rate of
10lb/ftsq of heating surface per/hr? - ANSWER-1000HP
If steam were reduced by a PRV from 500psi to 125psi, the steam at 125psi would
have - ANSWER-same heat as 500psi
Which device would be found on the inlet line of a steam turbine condenser? -
ANSWER-atmospheric relief valve
